Here is the full list of unlockable trophies for Back To The Future The Game Episode 1: It’s About Time for the PS3.
A Bicycle Built for Two (Gold) – Rescued Doc from Kid Tannen
A Plausible Explanation (Bronze) – Discovered the origin of the ‘new’ DeLorean
Back in Time (Silver) – Traveled back in time to rescue Doc
Deja Marty (Bronze) – Perfectly repeated dialog while repeating Doc’s temporal experiment
Doc’s Legacy (Bronze) – Got Doc’s Notebook back from Biff
Fate in flux (Bronze) – Heard about the curious fate of Marshall Strickland
Fuelmaster (Bronze) – Flawlessly mixed up a batch of Emmett’s Rocket Fuel
Grandpa Got Served (Silver) – Delivered the subpoeana to Arthur McFly
Hello, Young Friend (Bronze) – Talked Emmett into completing the Rocket Drill
Hi Bob! (Bronze) – Namechecked BTTF Creators
Jailbreak! (Silver) – Acquired Emmett’s Rocket Drill
Junior Bootlegger Badge (Silver) – Managed to get 190-proof alcohol delivered to Emmett’s